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Fig. 2 | Chemistry Central Journal

Fig. 2

From: Freeze-drying: an alternative method for the analysis of volatile organic compounds in the headspace of urine samples using solid phase micro-extraction coupled to gas chromatography - mass spectrometry

Fig. 2

Number of compounds identified per treatment for each volunteer. For the overall results, Mann–Whitney U test was applied to compare the number of compounds identified by Freeze-dry in relation to all the other treatments tested. (*) p value < 0.05; (**) p value < 0.01; (***) p value < 0.001; n ≥ 3

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BMC Chemistry

ISSN: 2661-801X

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